Register for and file your Self-Assessment tax return

Register if you're self-employed

If you have to send a tax return and did not send one last year, you need to register for Self-Assessment and Class 2 National Insurance.Register by 5 October in your business’s second tax year. You could be fined if you do not.

What happens next

You’ll get a letter within 10 working days (21 days if you’re abroad) with an activation code for your online account. You’ll need this the first time you sign in.
You can get a new activation code if you do not receive it or you lose it.